Question
A plate of area 20x10 cm2 is placed over the honey poured on the table. The layer of honey between plate and the table is 2.5mm thick. To move the plate with velocity 3 cm/s a horizontal force of 30720 dyne is required. Find the coefficient of viscosity of honey.
Solution
The formula for viscous force is given by,
Here given that,
Horizontal force, F = 30720 dyne
Area of the plate, A = 200 cm2
Velocity with which the plate is moved = 3 cm/sec
Thickness of the layer of honey between the plate and table = 2.5 mm
Putting the values in equation (1), we get
is the required coefficient of viscosity of honey.
